| /* Copyright (C) 2000-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <assert.h> |
| #include <errno.h> |
| #include <sysdep-cancel.h> /* Must come before <fcntl.h>. */ |
| #include <fcntl.h> |
| #include <stdarg.h> |
| |
| #include <sys/syscall.h> |
| #include <kernel-features.h> |
| |
| |
| #ifdef __ASSUME_F_GETOWN_EX |
| # define miss_F_GETOWN_EX 0 |
| #else |
| static int miss_F_GETOWN_EX; |
| #endif |
| |
| |
| static int |
| do_fcntl (int fd, int cmd, void *arg) |
| { |
| if (cmd != F_GETOWN || miss_F_GETOWN_EX) |
| return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg); |
| |
| INTERNAL_SYSCALL_DECL (err); |
| struct f_owner_ex fex; |
| int res = INTERNAL_SYSCALL (fcntl, err, 3, fd, F_GETOWN_EX, &fex); |
| if (!INTERNAL_SYSCALL_ERROR_P (res, err)) |
| return fex.type == F_OWNER_GID ? -fex.pid : fex.pid; |
| |
| #ifndef __ASSUME_F_GETOWN_EX |
| if (INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL) |
| { |
| res = INLINE_SYSCALL (fcntl, 3, fd, F_GETOWN, arg); |
| miss_F_GETOWN_EX = 1; |
| return res; |
| } |
| #endif |
| |
| __set_errno (INTERNAL_SYSCALL_ERRNO (res, err)); |
| return -1; |
| } |
| |
| |
| #ifndef NO_CANCELLATION |
| int |
| __fcntl_nocancel (int fd, int cmd, ...) |
| { |
| va_list ap; |
| void *arg; |
| |
| va_start (ap, cmd); |
| arg = va_arg (ap, void *); |
| va_end (ap); |
| |
| return do_fcntl (fd, cmd, arg); |
| } |
| #endif |
| |
| |
| int |
| __libc_fcntl (int fd, int cmd, ...) |
| { |
| va_list ap; |
| void *arg; |
| |
| va_start (ap, cmd); |
| arg = va_arg (ap, void *); |
| va_end (ap); |
| |
| if (SINGLE_THREAD_P || cmd != F_SETLKW) |
| return do_fcntl (fd, cmd, arg); |
| |
| int oldtype = LIBC_CANCEL_ASYNC (); |
| |
| int result = do_fcntl (fd, cmd, arg); |
| |
| LIBC_CANCEL_RESET (oldtype); |
| |
| return result; |
| } |
| libc_hidden_def (__libc_fcntl) |
| |
| weak_alias (__libc_fcntl, __fcntl) |
| libc_hidden_weak (__fcntl) |
| weak_alias (__libc_fcntl, fcntl) |